You usually don't need to create an instance of this class
yourself, as a collection of column instances will be created for
you from a list of column object literals you provide to the
Backgrid view class constructors.

Internally, columns are stored as a collection in the form of
Backgrid.Columns. In addition, all parent views will convert the
column definition into
a Backgrid.Columns
collection and pass a reference to any subviews that require
it.